From 2de024ba832eecca59a512e9f8e3e1f6e8a0d8a3 Mon Sep 17 00:00:00 2001
From: Loek Le Blansch <loek@pipeframe.xyz>
Date: Tue, 22 Oct 2024 15:51:40 +0200
Subject: WIP (broken) TXT parser

---
 TXTParser.cpp | 165 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 163 insertions(+), 2 deletions(-)

diff --git a/TXTParser.cpp b/TXTParser.cpp
index 17890e0..5d0820f 100644
--- a/TXTParser.cpp
+++ b/TXTParser.cpp
@@ -1,10 +1,171 @@
+#include <sstream>
+
 #include "TXTParser.h"
+#include "Color.h"
+#include "Exception.h"
+
+using namespace std;
 
 unsigned int TXTParser::heuristic() {
-	return 0;
+	bool grid = false;
+	int columns = 0;
+	int rows = 0;
+	int penalty = 1;
+
+	istringstream lines(this->get_file().read());
+	string line;
+	while (getline(lines, line)) {
+		if (line.back() == '\r') line.pop_back();
+
+		if (line.size() == 0) {
+			grid = true;
+			continue;
+		}
+		if (!grid) continue;
+
+		rows++;
+		if (columns == 0) columns = line.size();
+		penalty += abs(columns - static_cast<int>(line.size()));
+	}
+
+	if (grid == false) return 0;
+
+	if (columns == 1) penalty += 1000;
+	return (rows + columns) / penalty;
+}
+
+
+static void parse_header_def(MuseumDeserializer & d, const std::string & line) {
+	CanvasData data;
+
+	istringstream defs(line);
+	string def;
+	while (getline(defs, def, ',')) {
+		size_t equals = def.find("=");
+		if (equals == string::npos)
+			throw Exception("TXTParser: invalid def \"%s\"", def.c_str());
+
+		string key = def.substr(0, equals);
+
+		if (key == "rows") {
+			data.rows = stoi(def.substr(equals + 1));
+			continue;
+		}
+
+		if (key == "cols") {
+			data.columns = stoi(def.substr(equals + 1));
+			continue;
+		}
+
+		throw Exception("TXTParser: invalid key \"%s\"", key.c_str());
+	}
+
+	d.set_canvas(data);
+}
+
+static size_t header_idx(vector<string> header, string field) {
+	auto iter = find(header.begin(), header.end(), field);
+	if (iter == header.end())
+		throw Exception("header table is missing \"%s\" column", field.c_str());
+	return iter - header.begin();
+}
+
+static Color stocolor(const string & str) {
+	istringstream ss(str);
+	string red, green, blue;
+	getline(ss, red, ',');
+	getline(ss, green, ',');
+	getline(ss, blue, ',');
+	return {
+		.red = static_cast<unsigned int>(stoi(red)),
+		.green = static_cast<unsigned int>(stoi(green)),
+		.blue = static_cast<unsigned int>(stoi(blue)),
+	};
+}
+
+static void parse_header_table(MuseumDeserializer & d, const std::string & header, std::istringstream & rows) {
+	vector<string> table_header;
+	istringstream header_row(header);
+	string column;
+	while (getline(header_row, column, ','))
+		table_header.push_back(column);
+
+	size_t type_idx = header_idx(table_header, "letter");
+	size_t color_idx = header_idx(table_header, "rgb");
+	size_t weight_idx = header_idx(table_header, "weight");
+
+	string row;
+	while (getline(rows, row)) {
+		if (row.back() == '\r') row.pop_back();
+		if (row.size() == 0) break;
+
+		unsigned int col_idx = 0;
+		string col = "";
+		string stack = "";
+		vector<string> cols = {};
+
+		for (char c : row) {
+			if (c == stack.back()) {
+				stack.pop_back();
+				continue;
+			}
+			if (c == '[') {
+				stack.push_back(']');
+				continue;
+			}
+			if (stack.size() == 0 && c == ',') {
+				cols.push_back(col);
+				col.clear();
+				continue;
+			}
+			col.push_back(c);
+		}
+		if (col.size() > 0) cols.push_back(col);
+		
+		if (cols.size() != 3)
+			throw Exception("invalid header table row");
+
+		d.add_type(
+			cols[type_idx],
+			stocolor(cols[color_idx]),
+			stoi(cols[weight_idx])
+		);
+	}
+}
+
+static void parse_header(MuseumDeserializer & d, istringstream & input) {
+	string line;
+	while (getline(input, line)) {
+		if (line.back() == '\r') line.pop_back();
+		if (line.size() == 0) break;
+
+		if (line.find("=") != string::npos) {
+			parse_header_def(d, line);
+		} else {
+			parse_header_table(d, line, input);
+			break;
+		}
+	}
+}
+
+static void parse_canvas(MuseumDeserializer & d, istringstream & input) {
+	unsigned int x = 0, y = 0;
+	char c;
+	while (input >> c) {
+		if (c == '\r') continue;
+		if (c == '\n') {
+			x = 0;
+			y += 1;
+		}
+		d.set_tile({ .x = x, .y = y, .type = string(1, c), });
+		x += 1;
+	}
 }
 
 void TXTParser::parse(MuseumDeserializer & d) {
-	printf("%s\n", __PRETTY_FUNCTION__);
+	istringstream input(this->get_file().read());
+
+	parse_header(d, input);
+	parse_canvas(d, input);
 }
 
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